Hermetically Sealed Relays, Dust Proof Relays, Solder Proof Relay, Mechanical Indicator Relays, Mumbai, India
 

Hermetically Sealed Relays, Dust Proof Relays, Solder Proof Relay, Mechanical Indicator Relays, IC Sockets, Burg Strip, Terminal Blocks, Mumbai, India

 
 
Coil
:
Relays for direct energization with AC supply. Unless otherwise specified AC coils may be used with 50Hz supply.
Ambient Temperature
:
Temperature measured directly near the relay. The maximum allowed value may not be exceeded, otherwise there is a chance for relay failure. (e.g. Coil overheating)
Bounce Time
:
Time interval between the first and final closing (or opening) of a contact, caused by a mechanical shock process in contact movement. These shock processes are called contact bounce.
Break Contact
:
A contact that is closed in the rest state of the relay and open in the operating state. (refer Normally Closed Contacts)
Bridging Contact
:
Special contact assembly in which two stationary contacts are connected by a movable bridge.
In open contact condition the bridge is separated on both its sides from the stationary contacts.
Due to this double interruption a bigger contact gap can be achieved.
This is of advantage especially at very high contact loads or when there are safety requirements. (refer Form Z type contacts)
Change Over Contact
:
Compound contact consisting of a make contact and a break contact with a common contact spring.
When one contact circuit is open the other one is closed. (refer Form C type contacts)
Coil Current
:
The current (by design) drawn by the coil for generating the magnetic pull force.
At the moment of switching the coil On, the current is higher than in continuous use.
Coil Resistance
:
Electrical resistance of the relay coil at reference temperature.
Coil resistance varies with temperature. (refer Pick-up voltage change due to coil temperature rise)
Contact Forms
:
This denotes the contact mechanism and number of contacts in the circuit.
Form A contacts are also called NO contacts or make contacts.
Form B contacts are also called NC contacts or break contacts.
Form C contacts are also called Changeover contacts
Contact Gap
:
Distance between the contacts in the open contact circuit condition.
Contact Rating
:
The current a relay can switch On and OFF under specified conditions of voltage and environmental parameters.
Contact Resistance
:
Electrical resistance of a closed contact circuit, measured at the terminals of the relay with indicated measuring current and voltage.
Continuous Current (Contacts)
:
Maximum value of current (RMS value at AC), which a previously closed contact can continuously carry under defined conditions.
Creepage Distance
:
Closest distance between two conductive parts, measured along the surface of insulated parts.
Dielectric Strength
:
Voltage (RMS Value in AC Voltage, 50Hz 1 min) the insulation can withstand between relay elements that are insulated from one another.
Driver Protection circuit
:
When the coil energization is switched off, a very high negative peak voltage is produced by the coil and it may reach more than 10-20 times the nominal coil voltage. Possible destruction of the semiconductor device (Driver) the coil circuit is the result. A solution is provided by a driver protection circuit that is a damping component, which is connected in parallel to the coil. It protects the driver but does slow the release time of the relay. Also known as coil snubber circuit.
Dropout Voltage
:
The Voltage at or below which all the contacts of an operated relay must revert to unoperated position. Also known as release voltage.
Dust Proof Relays / Solder Proof Relay
:
Relay with case for protection against dust and touch. With specified solder conditions are kept, no harmful amounts of flux or solder vapor penetrate into the relay.
Electrical Endurance (Electrical Life)
:
Number of operations until switching failure of a relay under defined Conditions of load and of ambient influences. The reference value specified for the life apply, unless otherwise specified, to a resistive load. At lower contact loads a substantially longer electrical life is achieved. At higher loads the electrical life is reduced substantially.
Hermetically Sealed Relays
:
Relay is equipped with metal case, its connecting pins are sealed with glass; it full fills highest requirements regarding sealing.
Inrush Current
:
This value specifies the instantaneous current that may flow on the defined conditions. (Voltage, Power Factor, Duration) when the contact closes. Depends on type of load.
Insulation Resistance
:
Electrical resistance, measured between insulated relay parts at a test voltage of 500VDC
Make Contact
:
A contact that is open in the rest state and closed in the operating state. (refer normally open contacts)
Material Transfer
:
During the switching procedure the arc heats up the two contacts differently, depending on the load and polarity. This result in a material transfer from the hotter to the cooler electrode. With a higher DC loads on the contact, a 'pip' is build up, the other contact looses material and it creates a crater.
Maximum Carrying Current
:
The maximum current which after closing or prior to opening, the contacts can safely pass without being subject to temperature rise in excess of their design limit.
Maximum Continuous Voltage
:
The maximum voltage that can be applied to relay coil continuously with out causing damage.
Maximum Switching Current
:
The maximum current that can safely be switched by the contacts.
Maximum Switching frequency
:
The maximum switching frequency which satisfies the electrical life under repeated operations by applying a pulse train at the rated voltage to the operating coil
Maximum Switching Power
:
The maximum value that can be switched by the contacts without causing damage.
Maximum Switching Voltage
:
The maximum open circuit voltage that can be safely be switched by the contacts.
Mechanical Endurance (Mechanical Life)
:
Number of switching operations without contact load during which the relay remains within the specified characteristics.
Mechanical Flag Indication
:
Mechanical indicator in relays (mostly industrial relays) which is linked to the contacts and shows their position.
Nominal Coil Power
:
Power consumption of the coil at nominal voltage and nominal coil resistance. Also known as Rated Power.
Nominal Coil Voltage
:
The voltage by design intended to be applied to the relay coil. Also known as Rated Voltage.
Open Relay
:
Relay without case or cover.
Operating Power
:
Coil Power at which the relay operates
Operate time
:
The time from the initial application of power to the coil until the closure of the normally open contacts. It is excluding bounce time.
PCB Relays
:
Relays designed for soldering into printed circuit boards.
Pick-up Voltage
:
The value of the voltage that should be applied to an un-operated relay coil at or below which all the contacts of the relay should operate.
Plug-in Relay:
:
Relays that are held in the socket by flat Plug-in terminals (Round Pins for Series 1R/2R/51/MK/LK).
Release Time
:
The time from the initial removal of power from the coil until the re-closure of the normally closed contacts. It is excluding bounce time.
Sealed Relay
:
Plastic base and cover are sealed with epoxy resin, after soldering into the PC board the relay may be cleaned in liquid or coated with varnish.
Sealing
:
open relay / dust proof relay / sealed relay / Hermetically Sealed relay.
Shock Resistance
:
It specifies at which mechanical shock (multiple of gravitational acceleration 'g' at half since wave and duration 11 ms) the closed contact has still not opened (failure criteria: contact interrupted for >10µS is) or no damage occurs.
Test Button
:
Test button (usually in industrial relays), which is accessible from outside :
if it is actuated by hand Or with a tool, it switches the contact circuit of a de-energized relay from Off to On condition. Some times it can be locked mechanically. The test button helps to trace the current path in a switchboard.
Vibration Resistance
:
It specifies the amplitude or the acceleration in a defined frequency range at which the
 
 
 
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